Regression: kernels since 2.6.26 are unusably slow

[Aneurin Price]

Hi,
Every kernel since 2.6.26 has been unusably slow for me - to the extent that I
initially thought they were hanging on boot. Exactly how bad it is seems to
vary, but it could take several minutes to boot, and then another minute or two
to log in (with bash pegging the CPU as it loads). Everything seems to need
vastly more CPU time than usual - it feels a little like I'm using a 486.

I've bisected the problem down to commit
42651f15824d003e8357693ab72c4dbb3e280836 (x86: fix trimming e820 with MTRR
holes). Having basically no idea what that means, I thought I'd try building a
kernel with MTRRs disabled, to see if that would make any difference, but no
joy.

Can anyone give me some idea of where to go next, or let me know what further
information I should provide?

Thanks,
Nye
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